"There is no event handler associated with this event" error when hiding input on change

[mifopen]

Describe the bug

I need to toggle an input after a user changed it and hit "Enter".
After hiding I get an error in the console.

To Reproduce

https://github.com/mifopen/blazor-bug-mvp

1. Change the value in the input
2. Press "Enter"

It's interesting, that the first step is necessary for reproduction.

Exceptions (if any)

Uncaught (in promise) Error: System.ArgumentException: There is no event handler associated with this event. EventId: '2'. (Parameter 'eventHandlerId')
   at Microsoft.AspNetCore.Components.RenderTree.Renderer.DispatchEventAsync(:5001/UInt64 eventHandlerId, EventFieldInfo fieldInfo, EventArgs eventArgs)
   at Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer.DispatchEventAsync(:5001/UInt64 eventHandlerId, EventFieldInfo eventFieldInfo, EventArgs eventArgs)
   at :5001/Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer.ProcessNextDeferredEventAsync()
    at Object.endInvokeDotNetFromJS (blazor.webassembly.js:1)
    at Object.invokeJSFromDotNet (blazor.webassembly.js:1)
    at Object.w [as invokeJSFromDotNet] (blazor.webassembly.js:1)
    at _mono_wasm_invoke_js_blazor (dotnet.6.0.0-preview.3.21201.4.js:1)
    at do_icall (:5001/_framework/dotnet.wasm:wasm-function[10596]:0x194e4e)
    at do_icall_wrapper (:5001/_framework/dotnet.wasm:wasm-function[3305]:0x79df9)
    at interp_exec_method (:5001/_framework/dotnet.wasm:wasm-function[2155]:0x44ad3)
    at interp_runtime_invoke (:5001/_framework/dotnet.wasm:wasm-function[7862]:0x12efff)
    at mono_jit_runtime_invoke (:5001/_framework/dotnet.wasm:wasm-function[7347]:0x118e5f)
    at do_runtime_invoke (:5001/_framework/dotnet.wasm:wasm-function[3304]:0x79d42)

Further technical details

• ASP.NET Core version 5.0.100

.NET SDK (reflecting any global.json):
 Version:   6.0.100-preview.3.21202.5
 Commit:    aee38a6dd4

Runtime Environment:
 OS Name:     Mac OS X
 OS Version:  11.2
 OS Platform: Darwin
 RID:         osx.11.0-x64
 Base Path:   /usr/local/share/dotnet/sdk/6.0.100-preview.3.21202.5/

Host (useful for support):
  Version: 6.0.0-preview.3.21201.4
  Commit:  236cb21e3c

.NET SDKs installed:
  3.1.302 [/usr/local/share/dotnet/sdk]
  5.0.100 [/usr/local/share/dotnet/sdk]
  6.0.100-preview.2.21155.3 [/usr/local/share/dotnet/sdk]
  6.0.100-preview.3.21202.5 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.21 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.21 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.5 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.6 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0-preview.8.20414.8 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0-rc.1.20451.17 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0-rc.2.20475.17 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0-preview.2.21154.6 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0-preview.3.21201.13 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.21 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.6 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0-preview.8.20407.11 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0-rc.1.20451.14 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0-rc.2.20475.5 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-preview.3.21201.4 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

• JetBrains Rider 2021.1.2

[SteveSandersonMS]

This was recently fixed in #31612 and #32017. The fix will ship in .NET 6 Preview 5.

For a workaround until then, you can use await Task.Yield() before hiding the text box. For example, updating your code:

    private async Task Callback(KeyboardEventArgs args)
    {
        if (args.Key == "Enter")
        {
            await Task.Yield();
            showInput = false;
        }
    }

Closing as duplicate.